APA (7 वां संस्करण) प्रशस्ति पत्र

Roewer, U. (2008). Environmental Protection Expenditure by Industry in the European Union 1997-2004. Statistic in focus: Environment and energy.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Roewer, Ute. "Environmental Protection Expenditure by Industry in the European Union 1997-2004." Statistic in Focus: Environment and Energy 2008.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Roewer, Ute. "Environmental Protection Expenditure by Industry in the European Union 1997-2004." Statistic in Focus: Environment and Energy, 2008.

चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.